Hi lme. I rescued an 8 foot version of the same style antenna in London Ontario last year. It has the same triangular plate as pointed in the below pic Also mine has the same configuration as yours with the round backplate ring offset to the left of the mount pipe. The man I got it from thought it was an EchoStar model dish. EchoStar equipment seems to have had an excellent reputation. He wasn't the original owner however. Mine didn't have any identifying marks or labels so its still conjecture on our part. I have seen photos of the same style dish out in Canadas prairie provinces also. Startrak is another Canadian brand that it might be.
Dish alignment is normal. The only thing offsetting the dish to the side does is put a load on the jack (actuator) when your aimed near your due south. Minimizes effects of a worn actuator screw or nut. I do the same, with a centered dish, by hanging weight on one side of the dish lip.